Ohio Treasurer Josh Mandel, the presumptive Republican Senate nominee, is now looking over his shoulder at wealthy investment banker Mike Gibbons.

Gibbons, a first-time candidate, entered the May 2018 GOP primary this week with a commitment to raise the millions of dollars he’ll need to loosen Mandel’s grip on the nomination, even if that means writing a substantial check from his personal fortune. Gibbons, 64, is running as an ideologically flexible political outsider in the mold of President Trump.

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